# properties.domain_id.description
The one domain this key is scoped to (dom_…). A scoped key can send and manage only this domain — ideal for a single site or CI job.

# properties.domain.description
Denormalized domain name, for display and fast scope checks.

# properties.name.description
User-supplied label (e.g. the site or service using it).

# properties.key.description
The key material (mk_live_…). Returned in full on list/create — treat like a password.

# properties.last_used_at.description
Last authenticated use, ms epoch — null if never used.